5 papers · 1 filter
Mixed baroclinic convection in a cavity
Abhishek Kumar, Alban Pothérat
We study the convective patterns that arise in a nearly semi-cylindrical cavity fed in with hot fluid at the upper boundary, bounded by a cold, porous semi-circular boundary at the…
Turbulence in a stably stratified fluid: Onset of global anisotropy as a function of the Richardson number
Jayanta K. Bhattacharjee, Abhishek Kumar, Mahendra K. Verma
It is necessary to introduce an external forcing to induce turbulence in a stably stratified fluid. The Heisenberg eddy viscosity technique should in this case suffice to calculate…
Sweeping effect and Taylor's hypothesis via correlation function
Mahendra Kumar Verma, Abhishek Kumar, Akanksha Gupta
We demonstrate the sweeping effect in turbulence using numerical simulations of hydrodynamic turbulence without a mean velocity. The velocity correlation function, C(k, τ ) decays…
Transient flows and reorientations of large-scale convection in a cubic cell
Andrei Vasiliev, Peter Frick, Abhishek Kumar +3
The transient processes of a turbulent large-scale convective circulation (LSC) in a cubic cell are investigated using large-eddy simulations for Rayleigh number $\Ray=10^8$ and Pr…
Statistical features of rapidly rotating decaying turbulence: enstrophy and energy spectra, and coherent structures
Manohar K. Sharma, Abhishek Kumar, Mahendra K. Verma +1
In this paper we investigate the properties of rapidly rotating decaying turbulence using numerical simulations and phenomenological modelling. We find that as the turbulent flow e…